#pragma once
#pragma once
/*
 *  sha1.h
 *
 *  Copyright (C) 1998, 2009
 *  Paul E. Jones <paulej@packetizer.com>
 *  All Rights Reserved.
 *
 *****************************************************************************
 *  $Id: sha1.h 12 2009-06-22 19:34:25Z paulej $
 *****************************************************************************
 *
 *  Description:
 *      This class implements the Secure Hashing Standard as defined
 *      in FIPS PUB 180-1 published April 17, 1995.
 *
 *      Many of the variable names in this class, especially the single
 *      character names, were used because those were the names used
 *      in the publication.
 *
 *      Please read the file sha1.cpp for more information.
 *
 */

#ifndef _SHA1_H_
#define _SHA1_H_

class SHA1
{

public:

	SHA1();
	virtual ~SHA1();

	/*
	 *  Re-initialize the class
	 */
	void Reset();

	/*
	 *  Returns the message digest
	 */
	bool Result(unsigned *message_digest_array);

	/*
	 *  Provide input to SHA1
	 */
	void Input(const unsigned char *message_array,
		unsigned            length);
	void Input(const char  *message_array,
		unsigned    length);
	void Input(unsigned char message_element);
	void Input(char message_element);
	SHA1& operator<<(const char *message_array);
	SHA1& operator<<(const unsigned char *message_array);
	SHA1& operator<<(const char message_element);
	SHA1& operator<<(const unsigned char message_element);

private:

	/*
	 *  Process the next 512 bits of the message
	 */
	void ProcessMessageBlock();

	/*
	 *  Pads the current message block to 512 bits
	 */
	void PadMessage();

	/*
	 *  Performs a circular left shift operation
	 */
	inline unsigned CircularShift(int bits, unsigned word);

	unsigned H[5];                      // Message digest buffers

	unsigned Length_Low;                // Message length in bits
	unsigned Length_High;               // Message length in bits

	unsigned char Message_Block[64];    // 512-bit message blocks
	int Message_Block_Index;            // Index into message block array

	bool Computed;                      // Is the digest computed?
	bool Corrupted;                     // Is the message digest corruped?

};

#endif
